Reciprocating steam-engine



. (No ModeL) 2 sheets-' -sheet 1.

' M. GEARY.

' REGIPROOATING STEAM E GINE, No. 347,104. PatentedAug. 10, 1886.

Phfllo-Limographer, Washington,

lllll -5147472 (No Model.) V 2 sheets-sheet 2. M. GEARY;

REGIPROGATING STEAM ENGINE. No. 347,104. Patented Aug. 10, 1886.

Al /s.

N. PETERS. Pholo-Lilhogmpher. Washington. D. C.

UNITED STATES MICHAEL GEARY, OF OIL CITY, PENNSYLVANIA.

RECIPROCATING STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 347,104, dated August10, 1886,

Application filed January 26, 1886. Serial No. 189.841. (No model.)

.To all whom it may concern.-

Be it known that I, MICHAEL GEARY, a citizen of the United States,residing at Oil City, in the county of Venangoand State of Pennsylvania,have invented certain new and useful Improvements in Reciprocating SteamEugines; and I do hereby declare the following. to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same. 1

This invention relates to steam-engines; and it consists in'certainimprovements in the construction thereof, as will be hereinafter fullydescribed, and pointed out in the claims.

My invention is illustrated in the accompanying drawings as follows:

Figure 1 is a perspective ,view of my improved steam-engine. Fig. 2is asimilar view of the cylinder and connections and a fragment of the bedor frame, taken from the opposite side from that shown in Fig. 1. Fig. 3is a vertical'longitudinal sectional view of the cylinder andheater-chamber. Fig.4 is a transverse vertical sectional view of thecylinder, steam-chest, and heater-chamber. Fig. 5 is a longitudinalvertical sectional view of the steam-chest.

A marks the frame or bed.

B marks the cylinder.

0 marks the steam-chest.

D marks the exhaust or heater chamber.

S marks the steam-supply pipe.

F marks the exhaust-pipe.

S marks the live-steam passage in the steamchest.

0 marks the valve-chamber.

E marks the exhaust-steam passage in the steam-chest.

c and I) mark the jacket-spaces around the steam-chest and cylinder,respectively.

s marks a live-steam pipe, which connects the pipe S with thejacket-spaces, and s the waste-pipe or exit from said jacketspaces.

P marks the pump.

W marks the feed-water the pump.

W marks the feed-water pipes in the heaterchamber.

Other letters of reference will be referred to in proper connectionherein.

pipeleading from The construction is as follows: The cylinder andsteam-chest, with the necessary ports and passages, the valve-chamber,and the jacketspaces are formed in one piece of metal at one operationof casting, and this is attached to the frame A so as to overhang. Theheaterchamber is arranged below the cylinder and extends into the frame,and is secured to the cylinder by bolts d, which pass through lugs onthe side of the heater and into bosses B on the under side of thecylinder. The steamchest consists of a cylinder valve-chamber, O, alive-steam passage, S, an exhauststeam passage, E, and a surroundingjacketspace, c. The cylinder is of ordinary construction, and isprovided with a j acket-space, b, which opens into the jacket-space 0around the steam-chest. These jacket spaces entirely surround thesteam-chest and cylinder. A pipe, 8, connects these jacket-spaces withthe steam-supply pipe S, and a hand-valve is placed in this pipe 8. Awaste-pipe, s, which is always open, leads from these jacket-spaces.Before the engine is started the valve in the pipe 8 is opened, and livesteam fills the jacket-spaces and heats up the cylinder andvalve-chamber, after which the steam is out off and the engine isstarted. VI hen the engine is running, the jacket-spaces are filled,With air, or whatever air will remain therein, and steam is used thenonly before starting the engine. It is not at all essential that thejacket-space 1) around the cylinder be in connection with thejacket-space c, for it is not'as desirable to heat up the cylinderbefore starting as it is the valve-chamber.

Piston-valves require to be very closely fitted, and when fitted sothere will be no leakage when the chamber is hot they will stick whenthe chamber is cold.

Heretofore it has been common to jacket the valve-chamber with livesteam, and sometimes with exhaust-steam. The first construction isobjectionable, and it is wasteful of steam; and the second isobjectionable, first, because the exhaust-steam cannot be used to warmup the chamber before starting, and, second, because the exhauststeam isan absorbent of heat and chills the live steam when it enters thevalvechamber.

It will be at once observed that my construction is subject to none ofthe foregoing objections, for before starting the valve-chamber can beperfectly heated, and after starting the live steam in its passage tothe valve chamber is perfectly jacketed by a dead-air space, (or,perhaps, it is nearlya vacuum-spaee,) and is not in contact with largeradiating surfaces.

It is not essential that the eyliner and steamchest be cast in onepiece, for they may be cast separately and bolted together, andtherefore I do not wish to belimited to such a construction.

I am aware that it is common to arrange the heater-chamber in the bottomof the frame of the engine; but I am not aware that it has ever beforebeen so arranged in a frame with an overhanging cylinder, and projectingout underneath the cylinder and attached thereto so as to connect withthe mouth of the exhaustpassage.

The construction shown is very neat and compact.

\Vhat I claim as new is 1. In a steam-engine, the combination,substantially as set forth, of the cylinder B, steamchest 0, withlive-steam passage S, valvechamber 0 parallel with said steam-passage,jacket-spaces c and 1) around said passage S, valve-chamber O, andcylinder B, and the pipe .9 and s, connecting said jacket-spaces withthe steam'supply pipe and the open air in a manner substantially as andfor the purposes set forth.

2. In a steam-engine, the combination, substantially as set forth, of amain steam-cylinder chamber, a piston-valve chamber parallel with saidpiston-chamber, a live-steam passage parallel with said valve-chamber, ajacketspace surrounding said Valve-chamber and said live-steam passage,a steam-passage from the steam-so ppl y pipe to the said jacketspaec, apassage to the open air from said jacketspaee, and proper ports orpassages for live and exhaust steam.

3. In a steam-engine, the combination, substantially as set forth, of amain steam-cylinder chamber, a piston-valve chamber parallel with saidpistonchamber, a live'steam passage parallel with said valve-chamber, ajacketspace surrounding said valvechamber and steam-passage, asteam-passage from the steamsupply pipe to the jacket-space, providedwith a shut-off valve, a free passage from said jacket-space to the openair, an exhaust-passage from the middle and under side of thevalvechamber to a point below the main steam-cylinder chamber, and aheater-chamber below and parallel with the piston-chamber, connectedwith the mouth of thesaid exhaust-chamber.

In testimony whereof I affix my signature in presence of two witnesses.

MICHAEL GEARY.

Vitnesses:

.INo. K. HALLooK, Ron'r. H. PORTER.

